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Path.GetExtension Method

Returns the extension of the specified path string.

Namespace:  System.IO
Assemblies:   mscorlib (in mscorlib.dll)
  System.Runtime.Extensions (in System.Runtime.Extensions.dll)

static member GetExtension : 
        path:string -> string

Parameters

path
Type: System.String

The path string from which to get the extension.

Return Value

Type: System.String
The extension of the specified path (including the period "."), or a null reference (Nothing in Visual Basic), or String.Empty. If path is a null reference (Nothing in Visual Basic), GetExtension returns a null reference (Nothing in Visual Basic). If path does not have extension information, GetExtension returns String.Empty.

ExceptionCondition
ArgumentException

path contains one or more of the invalid characters defined in GetInvalidPathChars.

The extension of path is obtained by searching path for a period (.), starting with the last character in path and continuing toward the start of path. If a period is found before a DirectorySeparatorChar or AltDirectorySeparatorChar character, the returned string contains the period and the characters after it; otherwise, Empty is returned.

For a list of common I/O tasks, see Common I/O Tasks.

The following code example demonstrates using the GetExtension method on a Windows-based desktop platform.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8
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